
package com.codingday.app;

import java.util.Timer;
import java.util.TimerTask;
import android.content.Context;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;

public class MyLocation {
    Timer timer1;
    LocationManager lm;
    LocationResult locationResult;
    boolean gps_enabled=false;
    boolean network_enabled=false;
    LocationListener locationListenerGps = null;
    LocationListener locationListenerNetwork = null;

    public boolean getLocation(Context context, LocationResult result, int maximumDelay)
    {
    	Log.i("MyLocation","getLocation - Request");
        //I use LocationResult callback class to pass location value from MyLocation to user code.
        locationResult=result;
        
        if(result == null){
        	Log.i("getLocation","result is null");
        	return false;
        }
        
        if(lm==null)
            lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);

        //exceptions will be thrown if provider is not permitted.
        try{
        	gps_enabled=lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
        }catch(Exception ex){}
        
        try{
        	network_enabled=lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
        }catch(Exception ex){}

        //don't start listeners if no provider is enabled
        if(!gps_enabled && !network_enabled){
        	Log.i("MyLocation","both provider(gps and network) are disabled");
        	return false;
        }
        
        initListeners();
   
        if(network_enabled){
        	Log.i("MyLocation","network Enabled 1");
            lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListenerNetwork);
            Log.i("MyLocation","network Enabled 2");
        }else{
        	Log.i("MyLocation","network Disabled");
        }
        
        if(gps_enabled){
        	Log.i("MyLocation","gps Enabled 1");
            try {
				lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListenerGps);
			} catch (Exception e) {
				// TODO Auto-generated catch block
				Log.i("","Exceptions!!");
				e.printStackTrace();
			}
            Log.i("MyLocation","gps Enabled 2");
        }else{
        	Log.i("MyLocation","gps Disabled");
        }

//  		Criteria criteria = new Criteria();
//		
//        criteria.setAccuracy(Criteria.ACCURACY_FINE);
//        criteria.setAltitudeRequired(false);
//        criteria.setBearingRequired(false);
//        criteria.setCostAllowed(true);
//        criteria.setPowerRequirement(Criteria.POWER_LOW);
//		
//		String bestProvider = lm.getBestProvider(criteria, true);
//		Log.i("MyLocation"," before requestLocationUpdates");
//		lm.requestLocationUpdates(bestProvider, 10, 10, locationListenerGps);

		
        Log.i("MyLocation","getLocation - Request Completed");
        timer1=new Timer();
        timer1.schedule(new GetLastLocation(), maximumDelay);
        return true;
    }

    public void initListeners(){
    	locationListenerGps = new LocationListener() {
	        public void onLocationChanged(Location location) {
	            timer1.cancel();
	            locationResult.gotLocation(location);
	            lm.removeUpdates(this);
	            lm.removeUpdates(locationListenerNetwork);
	        }
	        public void onProviderDisabled(String provider) {}
	        public void onProviderEnabled(String provider) {}
	        public void onStatusChanged(String provider, int status, Bundle extras) {}
	    };
	
    	locationListenerNetwork = new LocationListener() {
	        public void onLocationChanged(Location location) {
	            timer1.cancel();
	            locationResult.gotLocation(location);
	            lm.removeUpdates(this);
	            lm.removeUpdates(locationListenerGps);
	        }
	        public void onProviderDisabled(String provider) {}
	        public void onProviderEnabled(String provider) {}
	        public void onStatusChanged(String provider, int status, Bundle extras) {}
	    };
    }
    class GetLastLocation extends TimerTask {
        @Override
        public void run() {
			Log.i("MyLocation","TimerTask start to run");
			lm.removeUpdates(locationListenerGps);
			lm.removeUpdates(locationListenerNetwork);
			
			Location net_loc=null, gps_loc=null;
			if(gps_enabled)
				gps_loc=lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
			if(network_enabled)
				net_loc=lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
			
			//if there are both values use the latest one
			if(gps_loc!=null && net_loc!=null){
				if(gps_loc.getTime()>net_loc.getTime())
					locationResult.gotLocation(gps_loc);
				else
					locationResult.gotLocation(net_loc);
				return;
			}
			
			if(gps_loc!=null){
				locationResult.gotLocation(gps_loc);
				return;
			}
			if(net_loc!=null){
				locationResult.gotLocation(net_loc);
				return;
			}
			locationResult.gotLocation(null);
        }
    }

    public static abstract class LocationResult{
        public abstract void gotLocation(Location location);
    }
}